Throttle or starting valve.



A. E. HUDSON.

THROTTLE 0R STARTING VALVE. APPLICATION FILED oec. I. 1913.

f. Him/ 115m 1HE NORRIS PETERS C0.y PHOT0-LITHO., WASHINGTON. D I

Patented Apr@ 20, 1915.

ALBERT EDIVIUND HUDSON, 0F CALGARY, ALB liJRlli., CANADA.

THROTTLE OR STARTING VALVE.

Application filed. December 1, 1913.

T0 all 'whom it may concern Be it lznown that l, ALBERT EDMUND HUD- son, a subject of the King of Great Britain, and resident of the city of Calgary, in the lrovince of Alberta, Bominion of Canada, have invented certain new and useful lmproveinents in Throttle or Starting Valves, ci which the following is the speciiication.

My invention relates to'engine throttles orv starting valves such as are found in railway practice, and the object of my invention is to automatically close the throttle valve with the operation of the train brakes, such closing taking place simultaneously with the actuation of the bralres, and it consists oit the improved mechanism actuated from the train train line pipe hereinafter particularly described by reference to the accompanying drawing and specication.

Figure l is a plan of the throttle lever and controlling mechanism. Fig. 2 is a front elevation ot the throttle and controlling mechanism. Fig. 3 is a longitudinal section through the controlling cylinder. y

Lilie letters of reference refer to like parts in the several drawings.

Referring to the drawing, F represents the throttle lever supported in the usual way from the boiler head G. y

'il represents a track obstacle controlled operating cylinder supported by a pivoting device 50 from the head of the boiler. The cylinder l-l is formed on one side with an auxiliary chamber 5l which connects with a port 52 at the outer end of the cylinder H and is provided with a second port 53 communicating with the inner bore of the cylinder il near the end remote from the port 52, the port 53 being normally closed by a check valve 5l of any suitable character which permits the compressed air to llow from the cylinder H to the chamber 51 but prevents return flow. A piston l is adapted to reciprocate in the cylinder H and is connected to a piston rod 55. The cylinder H is connected normally to the train line pipe and the pressure in the cylinder and chamber 5l will normally be the same, the piston l being forced to outermost position as shown in Fig. 8. Should the pressure on Specification of Letters Patent.

Patented Apr. 20, i915.

Serial No. 804,054.

the train line drop, however, the pressure in the cylinder H will fall below that in the chamber 5l and the expansion of the air in the chamber 51 through the port 52 will move the piston inwardly.

The outer end ot the piston rod 55 is slidably connected by a swiveling pin 56 with a plate 57 having a beveled end 58 which engages a corresponding beveled surface on a bracket 59 on the throttle lever. In this way when the piston rod 55 is drawn inwardly the plate 57 will be moved outwardly along the throttle lever. The plate 57 is further connected by a pin 60 with the latch 6l of the ratchet device of the lever, said pin extending through a slot 62 in the throttle lever. In this way when the piston rod 55 is drawn inwardly the ratchet device will be released and the throttle lever moved to closed position and the throttle closed.

The handle F is also drawn inwardly by reason of the nut 55, which forms a stop and prevents the piston rod 55 from slipping through the swivel pin 56 when the piston -moves inwardly. From this last position the throttle is oi course actuated to return by hand. lf however it is desired to close the throttle by hand this may be done by reason of the slidable connection between the piston rod and the handle such slidable connection being the swivel pin 56.

As many changes could be made in the above construction and many apparently widely different embodiments of my invention, within the scope of the claims, constructed without departing from the spirit or scope thereof, it is intended that all matter contained in the accompanying specilication and drawing shall be interpreted as illustrative and not in a limiting sense.

l/Vhat l claim as my invention is:

ln a device of the type described, means for actuating the throttle lever by reduction of pressure in the train line pipe, comprising a cylinder having a chamber located at one side thereof and communicating at one end with the train line pipe, a piston in said cylinder normally held at the opposite end thereof, said piston being operatively connected to the throttle, one end of said chamber communicating with said cylinder In Witness whereof I have hereunto set; between the last Vnamed end thereof and said my hand in the presence of two witnesses.

piston, a check valve between the opposite T end of said chamber and the cylinder, said ALBERT EDMUBD HUDSON' 5 check Valve being adapted to prevent the re- VVtne'sses:

turn of pressure from said chamber to said RUSSEL S. SMART,

cylinder. P. M. GARROW.

Copies of this patent may be obtained for fiveV cents each, by addressing the Commissioner of Patents,

- Washington, D. C. 

